<!DOCTYPE HTML>
<html>
<!--
-->
<head>
  <title>ArrayBuffer stream test</title>
  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />

<script type="text/javascript">
function detachArrayBuffer(ab)
{
  var w = new Worker("data:application/javascript,");
  w.postMessage(ab, [ab]);
}

function test()
{
  var ab = new ArrayBuffer(4000);
  var ta = new Uint8Array(ab);
  ta[0] = 'a'.charCodeAt(0);
  ta[1] = 'b'.charCodeAt(0);

  const Cc = SpecialPowers.Cc, Ci = SpecialPowers.Ci, Cr = SpecialPowers.Cr;
  var abis = Cc["@mozilla.org/io/arraybuffer-input-stream;1"]
               .createInstance(Ci.nsIArrayBufferInputStream);

  var sis = Cc["@mozilla.org/scriptableinputstream;1"]
              .createInstance(Ci.nsIScriptableInputStream);
  sis.init(abis);

  is(sis.read(1), "", "should read no data from an uninitialized ABIS");

  abis.setData(ab, 0, 256 * 1024);

  is(sis.read(1), "a", "should read 'a' after init");

  detachArrayBuffer(ab);

  SpecialPowers.forceGC();
  SpecialPowers.forceGC();

  try
  {
    is(sis.read(1), "b", "should read 'b' after detaching buffer");
  }
  catch (e)
  {
    ok(false, "reading from stream should have worked");
  }

  // A regression test for bug 1265076.  Previously, overflowing
  // the internal buffer from readSegments would cause incorrect
  // copying.  The constant mirrors the value in
  // ArrayBufferInputStream::readSegments.
  var size = 8192;
  ab = new ArrayBuffer(2 * size);
  ta = new Uint8Array(ab);

  var i;
  for (i = 0; i < size; ++i) {
    ta[i] = 'x'.charCodeAt(0);
  }
  for (i = 0; i < size; ++i) {
    ta[size + i] = 'y'.charCodeAt(0);
  }

  abis = Cc["@mozilla.org/io/arraybuffer-input-stream;1"]
           .createInstance(Ci.nsIArrayBufferInputStream);
  abis.setData(ab, 0, 2 * size);

  sis = Cc["@mozilla.org/scriptableinputstream;1"]
          .createInstance(Ci.nsIScriptableInputStream);
  sis.init(abis);

  var result = sis.read(2 * size);
  is(result, "x".repeat(size) + "y".repeat(size), "correctly read the data");
}

test();
</script>
</head>
<body>
<p id="display"></p>
<div id="content" style="display: none"></div>
<pre id="test">
</pre>
</body>
</html>
